This was often done using blastocysts from IVF clinics that would otherwise be discarded (often because the blastocysts were damaged and would not properly develop into a human, although IVF generates a large number of excess
healthy blastocysts that go unused as well).
Only
healthy blastocysts are implanted into the mother.
Not exact matches
Embryos from overweight and obese women that do reach the
blastocyst stage, did so on average 17 hours faster than comparable embryos from women of a
healthy weight.